Spark-plug



J. L. BRAKE.

SPARK PLUG.

APPLICATION mio 061.21. 1919.

Patented Feb. 1, 1921.

through the openings 18. When the spout of the can is removed from the electrode 13,

Ithe-spring 23 functions to simultaneously and projecting beyond the ends thereof, a

cap closing one end of the electrode, the opposite end of the electrode being substantially cone-shaped and provided with a plurality of openings, and an electrode carried by the casing.

2. A spark plug comprising a easing` an insulating sleeve associated with the casing, a hollow electrode arranged within the sleeve and projecting beyond the ends thereof, a cap closing one end of the electrode, the opposite end terminating in a plane above the lower end of the casing and having a plurality of apertures, said lower end of the Iasing having recesses, and an electrode carried by said casing.

3. A spark plug comprising a casing, an insulating sleeve associated therewith` a hollow electrode arranged within the and projecting beyond the ends thereof, a cap closing one end of the electrode, the opposite end having a plurality of apertures. and a normally seated valve arranged within the electrode immediately above said apertures for the purpose specified.

4. A spark plug comprising a casing` an insulating sleeve associated with the casing, a hollow electrode arranged within the sleeve, means closing one end trode, the opposite end having a plurality of apertures, an electrode carried by the rasing. valves arranged within the hollow electrode, a stem connecting said valves together,

and resilient means for normally holding f said valves seated.

In testimony whereof I aiix in v signature.

JAMES LEWIS DRAKE.

sleeve 

